How to Turn a Shower into a Sauna: A Step-by-Step Guide to Converting

Your shower is just a shower, quick and routine, but not truly relaxing. But what if you could transform it into a soothing sauna experience?

Missing out on deep relaxation and health benefits can be frustrating. The good news is you do not need an expensive renovation.

With a few simple tweaks, you can turn your shower into a personal sauna. Here is how!

Key Takeaways

DIY sauna conversion costs between $500–$2,000, while professional installation can exceed $5,000.
A DIY sauna project requires insulation, proper ventilation, and careful electrical work to avoid mistakes.
Choosing the right materials, like cedar wood and sauna-grade vapor barriers, improves durability.
Regular maintenance, including cleaning stones and checking ventilation, ensures long-term sauna performance.
Hiring a professional may save time and prevent costly errors, but DIY can be more budget-friendly if done correctly.

DIY vs. Professional Installation

Cost: Which option is more budget-friendly?

DIY installation is typically the cheaper route, costing anywhere from $500 to $2,000, depending on materials and equipment.

Hiring a professional, on the other hand, can cost upwards of $5,000, factoring in labor and expertise.

However, hidden costs can creep into a DIY project—unexpected repairs, tool rentals, and potential mistakes that require fixes.

Renting tools might seem like a way to cut costs, but frequent trips to the hardware store can add up.

While professionals charge for labor, their efficiency may prevent costly errors, making their services a worthwhile investment in the long run.

Time Required: How long will each take?

Converting a shower into a sauna can take a few days to a few weeks, depending on your experience and the complexity of the project.

For a DIY setup, you may spend several weekends on the conversion. Professional installation typically takes less time since experts handle everything.

Either way, be prepared for a significant time investment to ensure your sauna works properly and safely.

Skill Level: Do you need expertise?

DIY sauna installation requires a good level of craftsmanship. You’ll need to handle tasks like insulating, installing a heater, and ensuring proper ventilation.

It's essential to be comfortable with tools and to understand the technical requirements, like safely setting up the sauna heater and sealing the area to prevent moisture damage.

If you're not confident, professional installation might be the better choice for a safer, more effective sauna.

Tools Needed: What equipment is required?

Essential tools include a staple gun for foil insulation, a utility knife for fiberglass, a drill, screwdriver, level, and sealant gun.

These tools are crucial for both assembling the sauna structure and ensuring proper insulation.

You’ll also need screws, nails, and possibly wood adhesive depending on the materials you're working with.

Gathering everything upfront will streamline your installation process, reducing delays and ensuring all necessary components are readily available.

Customization: How much flexibility do you have?

The DIY installation of a sauna requires careful planning and organization. Begin by measuring the space to ensure your sauna kit fits perfectly.

Once measurements are confirmed, use your utility knife to cut insulation material and a staple gun to secure it to the walls.

Be sure to double-check all electrical connections if you're installing an electric sauna heater.

Proper ventilation is also essential to ensure air circulation within the sauna, so don’t forget to install the intake and exhaust vents according to the manufacturer's guidelines.

Mistake Risk: What could go wrong?

DIY installations come with a higher risk of mistakes. One of the most common issues is improper sealing, leading to heat and steam leaks.

Misalignment can affect both aesthetics and functionality. Safety hazards, like faulty electrical work, pose serious risks.

Additionally, DIY mistakes can void warranties, leaving you without protection. Fixing errors can be expensive—if a mistake requires professional intervention, you might end up spending more than if you had hired an expert in the first place. Precision is crucial, and even minor miscalculations can affect the final result.

Warranty & Guarantee: What protections do you get?

DIY installations rarely come with warranties unless the manufacturer explicitly allows self-installation.

Many warranties are voided if a product isn’t professionally installed. Professionals, however, often offer guarantees on their work, providing added peace of mind.

Manufacturer warranties may also differ depending on whether the installation was DIY or professional.

If something goes wrong down the line, a professional installation with a warranty can save you money on repairs.

When considering DIY, check the product’s warranty terms to ensure you don’t lose valuable coverage.

Safety Concerns: Is it safe to DIY?

Safety is a major factor when deciding between DIY and professional installation.

Electrical hazards, improper ventilation, and weak structural support are common risks.

If you're unsure about handling electrical work, it's best to call an expert. Compromising structural integrity by failing to reinforce walls or properly seal the space can lead to long-term issues.

If an installation feels beyond your abilities, stopping and seeking professional help is the safest choice.

Knowing when to step back is key to avoiding injuries, structural failures, or costly damages.

Long-Term Durability: Which lasts longer?

Professionally installed saunas typically last longer due to precise craftsmanship and high-quality materials.

DIY installations may suffer from wear and tear sooner if mistakes occur during the build. Improper sealing, weak framing, and subpar materials can lead to long-term durability issues.

While DIY can be cost-effective upfront, frequent repairs and maintenance might offset those savings.

A well-executed professional job ensures longevity and performance, making it a smart choice if you’re looking for a lasting investment. Saving money initially may not be worth it if the installation fails prematurely.

Materials and Tools Needed

Sauna Heater (Infrared or Traditional)

The sauna heater is the heart of your sauna system. You can choose between an infrared or traditional sauna heater.

Traditional heaters use stones to generate heat, while infrared heaters use light to directly warm the body.

The choice between these two options depends on your preferences and budget.

Infrared heaters generally cost less to install and maintain, while traditional heaters offer a more authentic sauna experience.

Sauna Wood (Cedar, Hemlock, or Pine)

The type of wood you choose influences durability, heat retention, and moisture resistance.

Cedar is a top choice due to its natural resistance to mold and warping. Hemlock is affordable and has a smooth finish, but it’s less resistant to moisture than cedar.

Pine is budget-friendly but more prone to cracking under extreme heat. Cedar generally lasts longer than both hemlock and pine, making it a great long-term investment.

If heat retention is a priority, cedar’s dense structure makes it an excellent choice, while hemlock offers a neutral scent for those sensitive to strong aromas.

Insulation (Foil or Fiberglass)

Proper insulation is key to maintaining the heat in your sauna. Use high-quality materials like foil or fiberglass to insulate the walls, floor, and ceiling of your converted shower space.

The goal is to trap heat within the sauna and prevent it from escaping into the rest of the bathroom.

If not properly insulated, your sauna will be inefficient and will struggle to maintain high temperatures.

Vapor Barrier (Prevents Moisture Buildup)

A vapor barrier protects your walls from moisture damage, which is essential in a sauna environment.

Common materials include aluminum foil, polyethylene sheeting, and specialized sauna-grade barriers.

For effective moisture control, the barrier should be at least 6 mils thick. Installation should cover the entire sauna interior, sealing edges with aluminum tape to prevent air leaks.

In basements or humid areas, thicker barriers work best to prevent condensation issues.

When sealing, opt for high-quality adhesives or vapor tape to ensure long-lasting protection against moisture damage.

Sauna Stones (For Traditional Steam Saunas)

Sauna stones play a vital role in heat distribution. They are usually made from peridotite, olivine, or vulcanite, as these materials retain heat well and resist cracking.

Avoid using random rocks, as they may explode when heated. The best stones for sauna heaters have a rough surface to hold water effectively, creating a rich steam experience.

Arrange stones in a loose stack to allow airflow while maximizing heat retention.

Regularly cleaning them prevents dust and debris buildup, ensuring optimal performance.

Replacing damaged stones prevents inefficient heating and prolongs the lifespan of your sauna.

Ventilation System (Ensures Proper Airflow)

A well-designed ventilation system keeps the sauna safe and comfortable. Key factors include intake and exhaust vent placement to maintain fresh air circulation.

Materials like stainless steel or aluminum are common for sauna ducts due to their durability.

Ideally, intake vents should be placed near the heater, while exhaust vents work best at a higher position on the opposite wall.

Poor ventilation can lead to heat loss or excessive humidity buildup, so ensuring ducts are properly sealed with heat-resistant tape helps maintain efficiency. A good ventilation system enhances comfort and prolongs the sauna's lifespan.

Thermometer & Hygrometer (Monitors Temperature & Humidity)

Monitoring sauna conditions ensures a safe and comfortable experience. A thermometer measures heat levels, while a hygrometer tracks humidity.

These tools work together to help maintain the ideal sauna climate. Bimetallic and digital thermometers are both great options, while analog hygrometers are preferred for their accuracy in high humidity.

Placement matters—thermometers should be mounted at eye level away from direct heat, while hygrometers should be positioned at a mid-height level for an accurate humidity reading.

Choosing high-quality instruments ensures consistent and reliable readings every session.

Sauna Door (Tempered Glass or Wood)

The sauna door affects both heat retention and aesthetics. Wooden doors, typically made from cedar or hemlock, provide excellent insulation.

Tempered glass doors offer a modern look but should be at least 8mm thick for durability.

A glass sauna door may require additional sealing to prevent heat loss. Stainless steel or brass hinges work best for durability under high temperatures.

While glass doors can be frameless, a properly sealed frame improves energy efficiency.

Using heat-resistant seals ensures minimal heat and steam leakage, keeping your sauna at the desired temperature.

Lighting (Heat-Resistant LED or Traditional Sauna Light)

Lighting in a sauna should be heat-resistant to ensure safety. Choose LED lights or traditional sauna lights that can withstand high temperatures.

Be sure to check the lights periodically for any issues with wiring or overheating. Lighting not only adds to the ambiance but also helps you maintain visibility for safe use.

Regular maintenance of your sauna lighting ensures that it continues to function properly and adds to the overall sauna experience.

Bucket & Ladle (For Pouring Water Over Stones)

A sauna bucket and ladle complete the traditional sauna experience. Buckets are often made from cedar, stainless steel, or aluminum, each offering durability and heat resistance.

Not all buckets and ladles can withstand sauna temperatures, so choosing purpose-built ones is crucial.

The ideal bucket size for home saunas is around 4-6 liters. Long-handled ladles help safely control water distribution over hot stones.

Deep ladles allow for larger pours, creating intense steam bursts, while shallow ladles provide a gentler effect. Proper tools ensure a comfortable and authentic sauna session.

Maintenance and Cleaning Tips

Keep It Clean Daily (Regular Cleaning)

To keep your sauna in the best condition, cleaning it on a regular basis is essential. Wipe down the walls, seating, and other surfaces after each use to remove sweat, oils, and debris.

Use a gentle cleaner designed for wood or sauna surfaces to avoid damaging the materials.

Clean the sauna stones periodically and remove any built-up residue. Keeping your sauna clean helps to prevent mold growth and keeps the environment fresh.

Deep Clean When Needed (Deep Cleaning)

In addition to regular cleaning, a deep clean is necessary every few months or as needed.

This involves thoroughly scrubbing the sauna's interior, including the walls, benches, and floor.

You may also need to clean the sauna stones and inspect the heating elements for any buildup.

A deep clean ensures your sauna remains hygienic and free from mold or mildew, especially in areas with high humidity levels.

Take Care of the Wood (Wood Care)

Inspect your sauna’s wood regularly for signs of damage or excessive wear. Over time, sauna wood may become discolored or develop splinters.

Sand down any rough patches and treat the wood with sauna-friendly oils to preserve its appearance and durability.

Be proactive about maintaining the wood to avoid costly repairs and ensure your sauna remains in top condition.

Check Ventilation Regularly (Ventilation Check)

Good ventilation is crucial for a sauna to function properly. When converting a shower into a sauna, ensure you install a proper ventilation system to maintain airflow.

This will help reduce moisture buildup and ensure a steady temperature. Regularly check the ventilation system to ensure it is working efficiently.

Without proper ventilation, your sauna could become overly humid, which may lead to mold growth and other issues.

Maintain the Heater (Heater Maintenance)

Maintaining the sauna heater is vital to ensuring your sauna operates effectively and lasts for years.

Regularly check the heater for any buildup of mineral deposits or other signs of wear.

For traditional heaters, it’s important to inspect the sauna stones and replace them as necessary.

With infrared heaters, check the heating elements for any signs of damage. Regular maintenance will help prevent costly repairs and ensure the best performance.

Prevent Mold Growth (Mold Prevention)

Mold growth is a common concern in saunas due to the high humidity levels. To prevent mold from forming, ensure that your sauna is properly ventilated. Keep the humidity levels in check and clean your sauna regularly.

If mold is found, act quickly by scrubbing the affected areas with a mild cleaning solution designed to remove mold. Regular maintenance and a focus on airflow will help keep mold at bay.

Clean the Sauna Stones (Stone Cleaning)

Sauna stones collect residue over time and need regular care. Rinse them with warm water every few weeks to remove dirt and minerals.

Never use soap or detergents, as they can leave harmful residues. If buildup occurs, soak the stones in a vinegar solution before scrubbing them gently with a brush.

After cleaning, let them dry completely before using again. If stones crack or crumble, replace them immediately to maintain heating efficiency.

Proper stone maintenance ensures even heat distribution and a more enjoyable sauna session.

Waterproof to Protect (Waterproofing Tips)

Waterproofing is essential to protect the sauna from moisture damage. Regularly check walls and floors for signs of water damage or peeling coatings.

If the waterproofing layer is wearing off, reapply a sauna-safe sealant to prevent future issues.

Proper waterproofing will not only extend the life of your sauna but also ensure a safe and comfortable environment.

Eliminate Unwanted Odors (Odor Control)

A fresh-smelling sauna enhances relaxation. Sweat, moisture, and bacteria can create unwanted odors, so regular cleaning is key.

Placing a bowl of baking soda or activated charcoal inside helps absorb lingering smells. Essential oils like eucalyptus or lavender can also refresh the air.

If musty odors persist, check for mold or mildew in hidden corners. Proper ventilation helps air circulate, preventing stale smells from developing. With a few simple tricks, your sauna will always smell clean and inviting.

Inspect for Damage Often (Inspection Routine)

Frequent inspections keep your sauna running smoothly. Check for cracks, warping, or loose boards at least once a month.

Inspect electrical components and heaters for any signs of wear. Keep a small log to track any minor damages before they worsen.

A flashlight helps spot hidden issues, and a moisture meter can detect excess dampness. Addressing small repairs early prevents costly fixes later.

By staying proactive, you’ll enjoy a safe, efficient, and long-lasting sauna experience.

Cost of Converting a Shower Into a Sauna

The cost of converting a shower into a sauna can vary greatly depending on whether you take a DIY approach or hire professionals.

DIY projects are more budget-friendly, but you must purchase materials, tools, and time.

On the other hand, hiring professionals will increase the overall cost due to labor charges.

While DIY can be cost-effective, remember that the final result will depend heavily on your skill level, and the materials and tools chosen can also impact the price.